Stability, proper posture, correct riding position, alignment, and endurance are all needed to become a highly-skilled rider. Improving these aspects would aid the horse's understanding of the commands and increase the probability of a desirable response. Body power, balance, stance, and riding position are all addressed in basic exercises for riders. Improving the aspects won't happen overnight; mastering them can take months or years. Visit our most recent blog if you want to strengthen your horse riding position. 
https://theblogulator.com/5-horse-riding-position-tips-that-you-should-fix-for-better-riding/